The most widely accepted explanation for the ascent of sap in trees is
Correct answer: D. Transpiration cohesion theory of Dixon
- A. Capillarity
- B. Roll of atmospheric pressure
- C. Pulsating action of' living cells
- D. Transpiration cohesion theory of Dixon
Explanation
The transpiration cohesion theory states that water molecules in the xylem of a tree are held together by cohesion, or the attraction between water molecules. The water molecules are also attracted to the walls of the xylem vessels, creating tension. The tension in the water column is what pulls the water up the tree.
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About Digestion
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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